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source for relay

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cjhukill(at)cox.net
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Posted: Thu Dec 10, 2009 4:33 am Post subject: source for relay

I'm back on the list after a couple of years  building hiatus, and now am wiring my RV10. I need a source for a high quality,  low holding current, 20 amp or more rated, continuous duty relay. I need one for  the avionics master, and one for the alternate ebus source. I've checked the  archives, and couldn't find anything. Does anyone have a source for  these?

 Chris Hukill

   [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Dec 10, 2009 8:01 am Post subject: source for relay

At 06:12 AM 12/10/2009, you wrote:

  	  Quote: 	
		   I'm back on the list after a couple of years building hiatus, and now am wiring my RV10. I need a source for a high quality, low holding current, 20 amp or more rated, continuous duty relay. I need one for the avionics master, and one for the alternate ebus source. I've checked the archives, and couldn't find anything. Does anyone have a source for these?

 Chris Hukill

 	


    Not sure what your criteria is for "low holding current".

    The physics of relay construction are rather limiting when

    trading off pull in voltage vs. holding current vs. meeting

    specs over a wide temperature range. 



    For years we've recommended plastic, automotive relays

    having fast-on tabs that are not unlike this . . .



  http://aeroelectric.com/Pictures/Relays/Plastic_Relay_2.jpg



   http://aeroelectric.com/Pictures/Relays/s704-1l.jpg



    These are inexpensive and available from dozens of

    suppliers.



    However, given that electro-mechanical relays are the

    LEAST reliable of all your power control devices,

    they should be used in situations where loss of function

    is either no big deal -OR- backed up with a Plan-B.



    Before folks run out and start ripping relays out

    of their airplanes, understand that the statement above

    is comparative. Certainly our cars are fitted with

    buckets full of relays. Nonetheless, most of us are

    unaware of their presence because we're very seldom

    faced with a need to replace one. But those are CARS

    and not AIRPLANES. The rule of thumb for factoring

    a relay into an airborne system design calls for due

    consideration and mitigation of failure mode effects.



 

 

        Bob . . .    [quote][b]

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